A kind of modified titanium dioxide and its application in spraying of outdoor pvc wood-plastic products

Abstract

The invention belongs to the technical field of production of finishing paint of wood-plastic products and particularly discloses modified titania. The modified titania is prepared through the following steps: (S1) blending talcum powder, TiCl4 and NaOH, adjusting the pH value to 2 to 5, producing TiO2 from TiCl4 and NaOH through blended hydrolysis, coating TiO2 by the talcum powder so as to produce TiO2 / talcum powder precursor, and carrying out calcining, so as to obtain a TiO2 / talcum powder composite material; (S2) adding a dispersant into the TiO2 / talcum powder composite material obtained in the step (S1) for dispersion, adjusting the pH to 8 to 12, carrying out dispersing so as to produce slurry, adjusting the pH to 7 to 10, and adding cerium nitrate for coating; (S3) aging the mixture obtained in the step (S2), adding alkali liquor into the aged mixture, adjusting the pH to 7 to 10, carrying out secondary aging, cooling the secondary-aged material to room temperature, then, adjusting the pH to neutral, carrying out aging again, carrying out filtering, carrying out washing, carrying out drying, and carrying out grinding, thereby obtaining the modified titania. According to the modified titania provided by the invention, the advantages of titania, the talcum powder and the cerium nitrate are integrated, ultraviolet and ageing resistance of the wood-plastic finishing paint is enhanced, and the surface comprehensive performance of the wood-plastic products is good.

Description

technical field [0001] The invention belongs to the technical field of wood-plastic product topcoat production, and more specifically relates to a modified titanium dioxide and its application in outdoor PVC wood-plastic product spraying. Background technique [0002] There are various types of wood-plastic products currently on the market, but general PVC wood-plastic products are not suitable for outdoor use, and are easy to fade outdoors, which limits their application. [0003] The topcoat sprayed on the surface of outdoor wood-plastic products will pulverize and crack in the extremely unfavorable environment such as outdoor ultraviolet rays, acid rain and severe temperature changes, and the effective protection time for wood-plastic products is not long. [0004] At present, titanium dioxide with excellent weather resistance and UV resistance is added to the wood-plastic products on the market, but the untreated titanium dioxide has poor UV resistance, which further red...

AI Technical Summary

Problems solved by technology

[0002] There are many types of wood-plastic products currently on the market, but general PVC wood-plastic products are not suitable for outdoor use, and are easy to fade outdoors, which limits their application

[0003] The topcoat sprayed on the surface of outdoor wood-plastic products will pulverize and crack in the extremely unfavorable environment such as outdoor ultraviolet rays, acid rain and severe temperature changes, and the effective protection time for wood-plastic products is not long

[0004] Titanium dioxide with excellent weather resistance and UV resistance is added to the wood-plastic products currently on the market, but the untreated titanium dioxide has poor UV resistance, which further reduces its good UV resistance.

[0005] In addition, the wood-plastic products on the market still have the following shortcomings: the surface hardness of the product is not enough, resulting in poor impact resistance of the product; the surface is not smooth enough, which not only reduces the gloss of the product surface but also seriously affects the appearance

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